(insert-file-contents-as-binary): Return value.

[elisp/apel.git] / emu.el

diff --git a/emu.el b/emu.el
index bf1df70..0713415 100644 (file)
--- a/emu.el
+++ b/emu.el
@@ -103,16 +103,12 @@
 (cond (running-xemacs
        ;; for XEmacs
        (require 'emu-xemacs)
-       (cond ((featurep 'mule)
-             ;; for XEmacs with MULE
-             (require 'emu-20)
-             (require 'emu-x20)
-             )
-            (t
-             ;; for XEmacs without MULE
-             (require 'emu-latin1)
-             ))
-       )
+       (if (featurep 'mule)
+          ;; for XEmacs with MULE
+          (require 'emu-x20)
+        ;; for XEmacs without MULE
+        (require 'emu-latin1)
+        ))
       (running-mule-merged-emacs
        ;; for Emacs 20.1 and 20.2
        (require 'emu-e20)
@@ -274,6 +270,59 @@ Value is nil if OBJECT is not a buffer or if it has been killed.
              (list 'select-window 'save-selected-window-window))))
 
 
+;;; @ Emacs 20.1 emulation
+;;;
+
+;; This macro was imported Emacs 20.2.
+(defmacro-maybe when (cond &rest body)
+  "(when COND BODY...): if COND yields non-nil, do BODY, else return nil."
+  (list 'if cond (cons 'progn body)))
+
+(defmacro-maybe save-current-buffer (&rest body)
+  "Save the current buffer; execute BODY; restore the current buffer.
+Executes BODY just like `progn'."
+  (` (let ((orig-buffer (current-buffer)))
+       (unwind-protect
+          (progn (,@ body))
+        (set-buffer orig-buffer)))))
+
+;; This macro was imported Emacs 20.2.
+(defmacro-maybe with-current-buffer (buffer &rest body)
+  "Execute the forms in BODY with BUFFER as the current buffer.
+The value returned is the value of the last form in BODY.
+See also `with-temp-buffer'."
+  (` (save-current-buffer
+       (set-buffer (, buffer))
+       (,@ body))))
+
+;; This macro was imported Emacs 20.2.
+(defmacro-maybe with-temp-buffer (&rest forms)
+  "Create a temporary buffer, and evaluate FORMS there like `progn'.
+See also `with-temp-file' and `with-output-to-string'."
+  (let ((temp-buffer (make-symbol "temp-buffer")))
+    (` (let (((, temp-buffer)
+             (get-buffer-create (generate-new-buffer-name " *temp*"))))
+        (unwind-protect
+            (with-current-buffer (, temp-buffer)
+              (,@ forms))
+          (and (buffer-name (, temp-buffer))
+               (kill-buffer (, temp-buffer))))))))
+
+;; This function was imported from XEmacs 21.
+(defun-maybe split-string (string &optional pattern)
+  "Return a list of substrings of STRING which are separated by PATTERN.
+If PATTERN is omitted, it defaults to \"[ \\f\\t\\n\\r\\v]+\"."
+  (or pattern
+      (setq pattern "[ \f\t\n\r\v]+"))
+  ;; The FSF version of this function takes care not to cons in case
+  ;; of infloop.  Maybe we should synch?
+  (let (parts (start 0))
+    (while (string-match pattern string start)
+      (setq parts (cons (substring string start (match-beginning 0)) parts)
+           start (match-end 0)))
+    (nreverse (cons (substring string start) parts))))
+
+
 ;;; @ Emacs 20.3 emulation
 ;;;